Print Quality - Xerox WorkCentre Pro 412 Service Manual

7-5 Print Quality

Error Status
Vertical black line
and band.
Vertical white
line.
No image.
Light image.
Dark image.
WorkCentre Pro 412
Launch Issue
Check
1. Bad blade in toner cartridge.
2. LSU.
1. LSU window contamination.
2. Toner cartridge.
1. Has the seal tape been
removed?
2. Is the GND OPC well
grounded?
3. LSU running well?
4. Is the bias voltage normal?
5. Low toner?
6. Is there video data from Main
PBA
1. Has the seal tape been
removed?
2. LSU light power normal?
3. Enough toner?
4. High charger voltage?
5. Lower bias voltage
6. Contamination of high voltage
contact
7. Transfer voltage and roller.
1. LSU light power normal?
2. Bias voltage output is high?
3. Video data is always supplied?
August 2001
Maintenance & Troubleshooting
Solution
1. Install a new toner cartridge.
2. Install a new LSU.
1. Clean LSU window.
2. If not LSU contamination,
install a new toner cartridge.
1. Remove the seal tape.
2. Measure the resistance
between. frame ground and
the ground spring attached to
the frame. If necessary clean
the components to achieve a
good earth.
3. Adjust LSU or install a new
LSI.
4. Normal Dev bias = -350V.
5. If necessary install a new
toner cartridge.
6. Test engine test pattern, if
necessary, install a new Main
PBA
1. Remove the seal tape
2. LSU light power check is diffi-
cult.
Compare with new one and
check.
3. Check toner and developer
counter
4 and 5. Check all high voltage
outputs
6. Leakage of toner cause bad
contacts and increases con-
tact resistance. Clean the con-
taminated area.
1. Check the rated level and
replace.
2. Set to correct voltage.
3. Replace defected board.
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